11. Essentially, a theory is an abstract, symbolic representation of __________reality.

　　(A) what it is conceived

　　(B) that is conceived

　　(C) what is conceived to be

　　(D) that is being conceived of

　　答案：C

　　考點(diǎn)：名詞從句。

　　分析：介詞of後只能接名詞賓語或名詞性賓語從句。what引導(dǎo)的從句為名詞從句，而that引導(dǎo)的從句則不可，接在介詞後面，故在(A)(C)中選擇。但(A)中what與it重複，故選(C)。且be conceived to be是固定結(jié)構(gòu)。

　　12. All of the plants now raised on farms have been developed from plants __________wild.

　　(A) once they grew

　　(B) they grew once

　　(C) that once grew

　　(D) once grew

　　答案：C

　　考點(diǎn)：定語從句。

　　分析：plants後的成份應(yīng)是其定語從句，應(yīng)在答案中選擇完整、適當(dāng)?shù)膹木�，�?C)。此從句中that作主語，不可省略，故(D)錯(cuò)。(A)與句意不合;(B)不通。

　　13. __________relatively costly, the diesel engine is highly efficient and needs servicing infrequently.

　　(A) Even

　　(B) It is

　　(C) Even though

　　(D) There is

　　答案：C

　　考點(diǎn)：連詞。

　　分析：逗號(hào)前後兩部分意思相反，需表轉(zhuǎn)折關(guān)係的連詞，即(C)。解題要點(diǎn);連詞even though如引導(dǎo)主系表結(jié)構(gòu)的從句，則常常省去主語和係詞be，此句即省掉了the diesel engine is.在結(jié)構(gòu)題中的四個(gè)答案中如有even though，應(yīng)當(dāng)首考慮這個(gè)選擇。

　　14. __________images out of clay, stone, and metal.

　　(A) The shaping of sculpture

　　(B) Sculpting the shapes

　　(C) To shape sculpture

　　(D) Sculptors shape

　　答案：D

　　考點(diǎn)：主謂結(jié)構(gòu)。

　　分析：本句主、謂語俱缺，應(yīng)在答案中選擇主謂結(jié)構(gòu)的形式，即(D)。

　　15. __________dates from the end of the eighteenth century.

　　(A) The modern circus

　　(B) That the modern circus

　　(C) While the modern circus

　　(D) The modern circus that

　　答案：A

　　考點(diǎn)：主語。

　　分析：dates是謂語動(dòng)詞，前面缺少主語。應(yīng)在答案中選擇名詞或名片語作主語，即(A)。

　　16. The boiled point of any liquid is determined by the pressure of the surrounding gases.

　　答案：A

　　考點(diǎn)：詞形。

　　分析：“沸點(diǎn)”的固定說法是boiling point，不用boiled�，F(xiàn)在分詞和過去分詞有時(shí)會(huì)被故意用錯(cuò)，應(yīng)記住現(xiàn)在分詞有“正在進(jìn)行”的意義，而過去分詞則給人“已經(jīng)完成”的感覺。試比較boiled water(煮開過的水)。

　　17. The Ranger spacecraft it provided more than 17,000 pictures of the moon.

　　答案：A

　　考點(diǎn)：多詞。

　　分析：名詞space craft做主語，it多餘。

　　18. Many people who live in New York City thinks that life in a large city offers special advantages.

　　答案：B

　　考點(diǎn)：主謂數(shù)的一致。

　　分析：主語是複數(shù)的Many people，因此謂語動(dòng)詞也要用複數(shù)形式think.

　　19. The scientific revolution of the early 1900’s affected education by change the nature of technology.

　　答案：C

　　考點(diǎn)：詞形。

　　分析：介詞by後面不能加動(dòng)詞原形，應(yīng)改用其動(dòng)名詞形式changing。

　　20. Meadowlarks are about the same size than robins, but they have heavier bodies, shorter tails, and longer bills.

　　答案：B

　　考點(diǎn)：習(xí)語。

　　分析：看到the same…應(yīng)注意其後是否有as。same…as…結(jié)構(gòu)是TOEFL考題中常出現(xiàn)的一種同級(jí)比較結(jié)構(gòu)。