46. This is the best novel that I ________ in this field.
A. have read B. has read C. read D. reads
【答案】A.
【解析】動詞時態(tài)。根據(jù)句意可知,that引導(dǎo)的從句應(yīng)用現(xiàn)在完成時,表示動作從過去某一時間開始一直延續(xù)到現(xiàn)在,并有可能延續(xù)下去。故選A。
47. It troubled him a lot ________ she refused to answer his call.
A. while B. that C. if D. for
【答案】B.
【解析】主語從句。分析句子結(jié)構(gòu)可知,It在句中作形式主語,真正的主語是空處引導(dǎo)的從句,所以應(yīng)用在從句中不作句子成分,只起連接作用的that。故選B。
48. The fact has worried many scientists ________ the earth is becoming warmer and warmer these years.
A. what B. which C. that D. though
【答案】C.
【解析】同位語從句。分析句子結(jié)構(gòu)可知,空處引導(dǎo)的是同位語從句,先行詞是fact,所以應(yīng)用在從句中不擔(dān)當(dāng)語法成分的that來引導(dǎo),that引導(dǎo)的從句是對fact(事實,真相)具體內(nèi)容的解釋說明。故選C。
49. A low-carbon (低碳) lifestyle has an effect ________ our daily life. People are paying more and more attention to ________ energies these days.
A. in; save B. in; saving C. on; save D. on; saving
【答案】D.
【解析】固定用法和非謂語動詞。have an effect on為固定搭配,意為“對……有影響”;pay attention to意為“注意,重視,留心……”,其中to為介詞,其后的動詞應(yīng)用動名詞形式。故選D。
50. The secretary worked late into night, ________ a speech for the president.
A. preparing B. to prepare C. prepared D. was preparing
【答案】A.
【解析】非謂語動詞。分析句子結(jié)構(gòu)可知,空處應(yīng)用非謂語動詞,作伴隨狀語。又因work和prepare這兩個動作同時發(fā)生,且prepare和其邏輯主語The secretary之間為主動關(guān)系,所以應(yīng)用現(xiàn)在分詞作伴隨狀語。故選A。