就给定资料所涉及到的主要问题，用1 200字左右的篇幅，自拟标题进行论述。要求深刻，有说服力。
参考答案：(略)
Americans eat_____vegetables per person today as they did in 1910.
A．more than twice
B．as twice as many
C．twice as many as
D．more than twice as many
间日疟患者外周血涂片可查见（）
A.环状体、滋养体、裂殖体、配子体
B.滋养体、配子体、合子、裂殖子
C.环状体、裂殖体、雌配子、雄配子
D.裂殖体、配子体、动合子、子孢子
E.环状体、滋养体、裂殖子、卵囊
