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【简答题】
• Fill in the blanks with one or two words after you hear the interview. • 1. People could be shocked to hear that the__________ never happened. • 2. The shadows of the ________ are pointing in different directions. • 3. The fact that the shadows point in different directions means that there must be two_____________ ——— studio lights. • 4. Because of the shadows, this photo must be a________. • 5. In the sixties, the US and Russia were in the middle of the Cold War. It was very important for both countries to show their _________ technology.
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皮皮学刷刷变学霸
举一反三
【单选题】减毒活疫苗所不具备的作用特点是
A.
能诱导机体产生细胞和体液免疫应答
B.
一般只需接种一次
C.
安全性优于死疫苗
D.
保存条件比死疫苗高
E.
免疫效果好，作用时问长