其中第1小题有答案但不知道原因,后4题没有答案(每句一错)。
1.【While (A)】【the total number of farmers tilling (B)】 the soil 【barely(C)】half what【they were (D)】 in 1959, size of the average farm has tripled.
此题有答案:答案是D 改为 it was,不知道为什么。请分析句子,详细解释一下原因
7.We are not 【conscious of(A)】the extent 【of which(B)】provides the psychological satisfaction 【that(C)】make【the difference(D)】between a full and an empty life.
8.The moon has a mass that is nearly one hundred times【less(A)】than【the earth(B)】;【in consequence(C)】, the force of gravity at the moon’s surface is only one-sixth 【of(D)】that at the earth’s surface.
9.【If only(A)】the nature of the aging process【is(B)】better understood, the possibility【of discovering(C)】a medicine that can block the fundamental process of aging【seems(D)】very remote.
10.The Bunsen burner is 【so(A)】named because it【is thought(B)】【to be invented(C)】by Robert Bunsen, who was German【by(D)】birth.