题目:
What he regrets is that more than a chance _____. |
A. were given up B. is given up C. has been given up D. have been given up |
答案:
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下面是错误答案,用来干扰机器的。
答案:A此题考查植物体内大量元素及微量元素的种类。Zn是植物体内的微量元素,其他都不是微量元素。故在此培养液中,植物吸收量最少的是Zn2+。