1. _________ directly with most metals to form compounds called carbides.
A. Carbon reacting
B. Carbon reacts
C. The reaction of carbon
D. When carbon reacts
答案:B
分析:從句意來看,called在這裏不是謂語動詞,而是分詞做後置定語:…… which are called carbides.空格中缺主語和謂語,選B.
參考譯文:碳直接跟大部分金屬反應而形成碳化物的化合物。
2. Meteorites are slowed down by Earth's atmosphere, but if they are moving _________, they can form a crater on impact.
A. enough fast
B. fast enough
C. so fast enough
D enough are fast
答案:B
分析:enough的用法,固定順序:adj.+enough
參考譯文:隕石受地球大氣阻擋而慢下來,但如果他們移動的足夠快,他們能在撞擊後形成一個大坑。
3. Located at the upper end of each________ an adrenal gland, an integral part of the endocrine system.
A. kidney which is
B. kidney is
C. kidney being
D. kidney
答案:B
分析:該句爲簡單句,而且使用了倒裝形式,原句爲:An adrenal gland, an integral part of the endocrine system is located at the upper end of each kidney.
參考譯文:腎上腺是內分泌系統的一個完整的部分,它位於腎的上端。
4. About 75 percent of all cadmium is used for cadmium plating of _________ such as iron and steel.
A. easily corroded metals
B. metals are easily corroded
C. corroded metals that easily
D. how easily metals corroded
答案:A
分析:B中的are多餘,否則句中出現兩個謂語,錯;C中的that引導定語從句,而從句缺謂語,錯;用法錯誤,of後一般接名詞。
參考譯文:75%的所有鎘金屬都用來對類似鐵、鋼的容易腐蝕的金屬進行鎘鍍膜了。
5. An atom is a basic structural unit of matter, the smallest particle of an element _________ into chemical combination.
A. that can enter
B. can it enter
C. when entering it can
D. that enters can
答案:A
分析:that引導定語從句,element爲先行詞。the smallest particle of an element 是 a basic structural unit of matter的賓語同位語。
參考譯文:原子是物體的基本結構單元,是元素形成化學組合特性的最小的顆粒。