课后练习:
1. The petrochemical industry has grown with the petroleum industry and is considered by some ___ a mature industry.
A to be B / C is D be
2. The chemical industry ___ very heavily ___ petroleum.
A depend, on B depends, on C depending, with D depending, as
3. It is likely ____ in excess of 90% of the literally thousands of different basic organic chemicals employed today are _____ these sources.
A which, derived from B which, derive from
C that, derive from D that, derived from
4. The _____ of materials such as petrochemicals is used to indicate the source of the chemical compounds.
A classify B classified C classification D classic
5. For example, the various reactions of petroleum heavy ends, in particular the asphaltenes, indicate that these materials may be regarded ____ chemical entities and are able to participate ______ numerous chemical or physical conversions to, perhaps, more useful materials.
A in, as B to, with C as, in D with, to
6. The petroleum era was_____ in by the 1859 finding at Titusville, Pennsylvania, but the flourishing of chemicals from petroleum has been only since the early twentieth century.
A used B ushered C usher D push
7.Natural gas is quite _____ in composition, but the major constituent (>60%) is methane.
A viable B variable C variety D vary
8. However, as is the case with the latest trends in changing crude oil types, it must also _____ to meet changing technological needs.
A revolve B involve C evolve D solve
9.The manufacture of chemicals or chemical intermediates from petroleum and natural gas constituents ____an excellent example of the _____of such materials to more valuable products.
A is, conversion B are, conversion C be, convert D was, conversation
10.The processing of petroleum hydrocarbon to yield materials that ____, essentially, the building blocks of other chemicals industries, ____now very extensive.
A is, is B are, is C are, are D is, are
11.Gasoline, kerosene, fuel oils. Lubricating oils, waxes, asphalts, and the like are ___ from the definition of petrochemicals, since they are not, in the true sense, chemical compounds but are in fact intimate mixtures of hydrocarbons.
A included B excluded C concluded D abstract
12. For example, the sulfonated and sulfomethlated materials and their derivatives have satisfactorily_____ tests as drilling mud thinners, and the results are comparable to those obtained with commercial mud thinners.
A undergone B undergo C gone D underwent
13.Reactions incorporating nitrogen and phosphorus into the asphaltenes are particularly significant at a time when the effects on the environment of many materials containing these elements are receiving ______ attention.
A consider B considerate C consideration D considerable
14.Other parameters, particularly the economics of the reaction sequences, including the costs of the reactant equipment, must also ____ consideration.
A take into B taken into C be taken into D to take into
答案:1A 2B 3D 4C 5C 6B 7B 8C 9A 10B 11B 12A 13D 14C