Scientists have rediscovered certain food crops, once commonly cultivated in the New World, which contain more protein per pound than do current staple food crops such as rice and wheat. Scientists claim that cultivation of these crops could greatly benefit densely populated countries that have low per-person calorie intake and inadequate source of protein.
Which of the following, if true, casts the most serious doubt on the claim made above
A．The average yield per acre of the rediscovered crops is substantially less than that of the current staple food crops.
B．Many important food crops, such as tomato, originated in the New World.
C．Wheat yields more protein per pound than does rice.
D．The rediscovered crops have more caloric per pound than do current, staple food crops.
E．(E) As few as 20 different food crops provide the bulk of the planet’s food supply.
，Ⅱ。深覆盖，下切牙咬在上牙腭侧龈组织，上前牙有散在间隙，上颌A区侧切牙舌向错位，下颌闭合道接近正中合时后退。面中1／3轻度前突，面下1／3较短