The Blue Grotto, or Grotta Azzurra, is a noted sea cave on the coast of the
island of Capri, Italy. It was discovered by a German writer in August 1826.
Since then it has become a popular tourist attraction. It is said that Roman
emperors used the grotto as a private bath and antique statues were found in
there. Inside the grotto, the sea seems to be lit from underwater. The
brilliant blue of the sea fascinates its visitors. The enchantment results
from another opening to the grotto, completely submerged. It allows the
sunlight to pass through and light the water from below, creating a blue
reflection that illuminates the cave. To get to Grotta Azzurra, there are
motorboats that leave from the port of Marina Grande. At the entrance to the
cave, passengers get into little rowing boats. The roof of the entrance is
only one meter above the sea level so passengers have to lie down in the boat
while passing into the cave. The grotto cannot be visited during adverse
weather conditions.
藍洞，或者Grotta Azzurra，在意大利Capri島的海岸著名海穴。在1826年八月由德國作
家發現。從那時起已成為一個熱門的旅遊景點。據說羅馬帝國皇帝使用洞穴作為一個私
人浴室和古董雕像被發現在那裡。裡面的洞穴，海水似乎是從水下點燃。絢麗的藍色大海
吸引著遊客。另一個開放的石窟也令人著迷，完全淹沒。它允許陽光通過，並點燃水從下
面，產生一個藍色的反射照亮了山洞。走進Grotta Azzurra，也有摩托艇，從Marina
Grande的港口出發。在入口乘客划艇進入。入口處的屋頂只有離海拔一米以上，所以乘客
不得不躺下在船上當通過進山洞。石窟不能在惡劣天氣條件下被參觀。
Which of the following statements is true?
(A)Passengers take motorboats into the grotto.
(B)The grotto has become famous since the 18th century.
(C)There are two openings to the grotto.
(D)The grotto was open to the public in Roman times.
答案給C，請教今年底要考聯招的高手們，A為何不能選？