Which of the following apertures lies in the central tendon of diaphragm? A: Oesophagus B: Inferior vena cava C: Thoracic duct D: Abdominal aorta

The third and fourth ventricles are communicated by A: interventricular foramina B: mesencephalic aquaduct C: median aperture D: lateral apertures E: arachnoid plexus

Professional astronauts are becoming ________ aware of how amateur astronauts can make valuable ________ their research. Furthermore, telescopes with small apertures(孔径) are ________ in some studies. (1 at work, 2 contributions to, 3 increasingly)