Tom is only four years old; I ________ leave him alone at home.
A. dare
B. daren't
C. dare to
D. daren't to
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He says he's 21 but he ________ be older than 18.
A. can
B. can't
C. wouldn't
D. could
Listen to the recording and choose the correct number according to what you have heard.[音频]Q: How many cups does the speaker need?
A. 2
B. 12
C. 20
D. 3
现在,我国经济社会发展和民生改善比过去任何时候都要更加需要科学技术解决方案,都更加需要增强()这个第一动力。(第五讲)
A. 创新
B. 技术
C. 科学
D. 能源
信息技术领域,()技术大幕开启,量子计算成为各国竞相追逐的战略制高点。(第五讲)
A. 2G
B. 3G
C. 4G
D. 5G